<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <!-- 准备一个容器 -->
    <div id="root">
        姓：<input type="text" v-model:value="firstName"><br>
        名：<input type="text" v-model:value="lastName"><br>
        全名：<span>{{firstName}}-{{lastName}}</span>
    </div>

    <script type="text/javascript">
        new Vue({
            el:'#root',
            data(){
                return{
                    firstName:'张',
                    lastName:'三'
                }
            },
        })
    </script>
</body>

</html>